Grate-bar



(NoMtdeL) J. L. MASON.

GRATE BAR.

Patented Oct. 17, 1893.

ATTORNEY.

UNITED STATES PATENT OFFICE.

J OHN L. MASON, OF BROOKLYN, NEW YORK.

GRAQTE-YBAR.

SPECIFICATION forming part of Letters Patent No. 506,922, dated October17, 1893.

Application filed July 16, 1892.

To all whom it may concern:

Be it known that 1, JOHN L. MASON, a citizen of the United States, and aresident of Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Grate-Bars, of which thefollowing is a specification.

The general object of my invention is to so construct a grate-bar as topermit a circulation of air through the body of the article, with a viewto counteract the effect of the heat to which it may be exposed; and tothis end it consists of the novel features hereinafter described.

In the accompanying drawings: Figure I, represents a side view of agrate-barembodying my invention as it appears when mounted in a furnace.Fig. II, represents a vertical longitudinal section thereof. Fig.IILrepresents a plan or top View of a series of the bars. Fig. IV,represents a cross section of the bar on-the line a:a; Fig. I. Fig. V,representsa like section thereof on the line yy Fig. I.

Similar letters of reference indicate similar parts.

The letter A, indicates the body of the grate-bar which is hollow andhas an opening B, at each of its ends, together with a series ofopenings 0, at, the bottom, intermediate of the endsthereof. The effectof the end-openings B, is to permit a circulation of air in alongitudinal direction and that of the bottom openings 0, to permit acirculation of air in a vertical direction, through the hollow bar; andit will be apparent that by this means the bar is kept in acomparatively cool state, tending to counteract the eifect of the heatthereupon; the result being to produce an extremely durable bar, by itsrequiring least frequent renewal in the furnace.

The central portion of each of the bars in which the openings 0 aremade, is of increased depth, and the walls of said openings diverge fromthe bottom upward to the passage 13, so that the said openings are ofincreasing Serial No. 440,248. (No model.)

width, whereby the air finds a ready inlet to said passage B. The depthof the bar at the mouth or lower end of the openingsis less than thedepth at the solid part of the lower wall or bottom of the bar betweenthe openings, so that air can readily enter the bar and at the same timethe strength of the bar be not impaired.

The body of the bar is provided with external ribs B on the top andsides, thereby strengthening the same.

In order to facilitate the hollow construction of the body A, with itsopenings B, O, the same is divided into two sections A, A which areunited by rivets D, or other suitable means; such division being in thevertical longitudinal plane of the bar, and the openings being at pointsbetween the sections, partly in one and partly in the other, as shown.

In applying the bar to use it may be connected with a rocking bare, forimparting thereto a longitudinally reciprocating motion,

as upon rollers f, supporting the bar.

What I'claim as my invention, and desire to secure by Letters Patent, is

1. A grate bar composed of two sections, each having a passage in itsside extending from end to end, and vertical grooves in its centralportion of increased width at top, and means for connecting saidsections, said parts being combined substantially as described.

2. A grate bar consisting of two longitudinal sections having thepassage B extending from end to end thereof, a central portion ofincreased depth, and external ribs on top and sides, said centralportion having a series of openings, the walls of which diverge from thebottom upward, forming openings of increased width from the bottom tothe said passage B, said parts being combined substantially asdescribed.

JOHN L. MASON.

Witnesses:

CHAS. WAHLERS, GEo. BREWSTER.

